WorksheetsUnit 6 Chemical Reactions
Total questions: 26
Worksheet time: 13mins
Name
Class
Date
1.
1) In a chemical reaction
a)
the number of atoms in the reactants and products must be the same
b)
the mass of the products is greater than the mass of reactants
c)
the number of atoms in the reactants and products must change
d)
energy as heat must be added to the reactions
2.
2) In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
a)
H
b)
2H
c)
H₂
d)
OH
3.
3) What is the whole number that appears in front of a formula in a chemical equation?
a)
a subscript
b)
a superscript
c)
a ratio
d)
a coefficient
4.
4) Al(OH)₃ + Cu₂S-->
a)
AlCu + S(OH)
b)
Al₂S + OH
c)
Al + Cu(OH)
d)
Al₂S + Cu(OH)
5.
5) N₂ + 3H₂ --> 2NH₃
Which of the following is the word equation for the above formula equation
a)
nitrogen + hydrogen --> nitrogen hydride
b)
nitrogen + hydrogen --> nitrogen trihydride
c)
dinitrogen + dihydrogen --> nitrogen trihydride
d)
none of these
6.
7) According to the law of conservation of mass, the total mass of the reacting substance(s) is
a)
always more than the total mass off the products
b)
always less than the total mass of the products
c)
sometimes more and sometimes less than the total mass of the products
d)
always equal to the total mass of the product(s)
7.
9) In the word equation, sodium oxide + water --> sodium hydroxide, the formula for sodium hydroxide is represented by
a)
Na₂(OH)
b)
Na(OH)
c)
NaO₂
d)
Na₂O
8.
11) Which word equation represents the reaction that produces water from hydrogen and oxygen?
a)
Water is produced from hydrogen and oxygen
b)
Hydrogen plus oxygen yields water
c)
H₂ + O₂ --> water
d)
Water can be separated into hydrogen and oxygen
9.
13) Aluminum + lead (II) nitrate -->
a)
aluminum nitrate + lead
b)
aluminum lead + nitrate
c)
aluminum (II) nitrate + lead
d)
No reaction
10.
14) Sodium + chlorine -->
a)
sodium monochloride
b)
sodium chlorine
c)
sodium chloride
d)
sodium monochlorine
11.
15) C₃H₆ + O₂ -->
a)
CO₂ + H₂O + O₂
b)
H₂O + O₂
c)
CO₂ + O₂
d)
CO₂ + H₂O
12.
16) What is the process that leads to the chemical transformation of one set of chemical substances into another?
a)
Physical change
b)
Chemical reaction
c)
Covalent bond
d)
Nuclear reaction
13.
17) The equation AB + CD --> AD + CB is the general equation for a
a)
synthesis reaction
b)
decomposition reaction
c)
single replacement reaction
d)
double replacement reaction
14.
18) In what kind of reaction does one element replace a similar element in a compound?
a)
single replacement reaction
b)
combustion
c)
decomposition reaction
d)
ionic reaction
15.
19) The equation A + B --> AB is the general equation for a(n)
a)
combustion reaction
b)
decomposition reaction
c)
synthesis reaction
d)
double replacement reaction
16.
20) A reaction that has oxygen (O₂ ) and produces carbon dioxide (CO₂) and water (H₂O) is what type of reaction?
a)
double replacement reaction
b)
decomposition reaction
c)
single replacement reaction
d)
combustion reaction
17.
21) What kind of reaction is this: element + element --> compound?
a)
synthesis reaction
b)
ionic reaction
c)
decomposition reaction
d)
double replacement reaction
18.
22) The equation AB --> A + B is the general equation for a
a)
synthesis reaction
b)
combustion reaction
c)
decomposition reaction
d)
single replacement reaction
19.
23) In what kind of reaction do the ions of two compounds exchange places to form two new compounds?
a)
synthesis reaction
b)
double replacement reaction
c)
decomposition reaction
d)
combustion reaction
20.
24) The following chemical reaction is a:
a)
synthesis reaction
b)
decomposition reaction
c)
single replacement reaction
d)
double replacement reaction
21.
25) The following chemical reaction is a:
a)
synthesis reaction
b)
decomposition reaction
c)
single replacement reaction
d)
double replacement reaction
22.
26) Which of the following is a decomposition reaction?
a)
Option 1
b)
Option 2
c)
Option 3
d)
Option 4
23.
27) The following chemical reaction is a:
a)
synthesis reaction
b)
decomposition reaction
c)
single replacement reaction
d)
double replacement reaction
24.
28)The following chemical reaction is a:
a)
synthesis reaction
b)
decomposition reaction
c)
single replacement reaction
d)
double replacement reaction
25.
29) The following chemical reaction is a:
a)
synthesis reaction
b)
decomposition reaction
c)
single replacement reaction
d)
double replacement reaction
26.
30) Which of the following is a combustion reaction?
a)
Option 1
b)
Option 2
c)
Option 3
d)
Option 4
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